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UPDATE: Progamming flaw or intentional secret level? here is the answer http://en.wikipedia.org/wiki/Super_Mario_Bros.#The_Minus_World i expect at least 50 more people to ignore this & comment "this is not a glitch"

so much f*ggotry on ytmnd, as usual. i'm going to 5 you, just because i hate the downvoters. "a well known nes error" my ass. only to geeks that spend all their time in their parents' basement discussing video games on internet bulletin boards. i've seen this glitch done before, but totally forgot about it. thanks for the nostalgia. here's your 5, cockf*g.

"co9 said it is only a known error "only to geeks that spend all their time
in their parents' basement discussing video games on" yet he says he has
heard it before..." therefore he is a geek that spend all his time
in his parents' basement discussing video games

I just want to point out it's not really world "negative one." Look at the way it normally is; for example, world 2-1. After going through the tunnel, the first number disappears, leaving the appearance of -1, although it's really more like "world null dash one."

Oh just to add, it's not "negative" at all... It's just that the world you entered hasn't got a number like World 1 Level 1 would be 1-1... This is -1, plus the fact it loops would just make it a test level for the water stages, even though not used it wasn't removed so when the game enconters and error because you didn't go the normal route, it drops you into this -1 world.

Cool animation, but very misleading. You use the word "flaws" in the plural, suggesting there are more clips in your YTMND. You just show the one, and it's neither epic nor flawed. Still cool for the memories, though.

Minus World FTW! I've always wondered, who at one point thought "I wonder what will happen if I break these two bricks and jump backwards? Maybe I'll go through the wall and discover a never-ending water level!" :P

just thought id explain why this happens for people who think this isnt a flaw... there are four exits to world 1-2 one on the right side of the screen and three on the bottom. when you go down a pipe thats not lined up with one of the exits the game doesnt know where to take you. it defaults the world to a blank tile in the game so it looks like "world -1"

I was a programming error, not intentional. The reason you slide through is because the game thinks you hit the block but you really didn't, so it makes you not solid for a second and allows you to clip into the wall.

And as we all know, when you clip into a wall in SMB, you slide out to the other side. When you jump into the pipe before it registers it as 4-1 destination, it loads 7-2 with no pointers, and names it world 36-1.

If it was a flaw it would not have obviously programmed aspects such as... the plants on the other side of the wall, the pipes, the fact that it's a unique level... how can it be a flaw? It must have been created, like the pokemon secret village or whatever

these downvoters are retarded.... this is the epic song, uhm, of course everyone knows about that, its 20 years old...... and just some other downvoters fail, fail miserably, im going to five because i have never seen this before and to slay the downvoters, f*ck you, for making my life miserable :)

To Peanut:IT IS A FLAW! Normally you're supposed to go above the wall at an earlier point and go ver the exit pipe to reach a Warp Zone, if you reach the other side without doing that you will enter the Minus World.